1311002132221 has 4 divisors (see below), whose sum is σ = 1327597096000. Its totient is φ = 1294407168444.

The previous prime is 1311002132171. The next prime is 1311002132239. The reversal of 1311002132221 is 1222312001131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311002132221 - 2⁷ = 1311002132093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311002132281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8297481771 + ... + 8297481928.

It is an arithmetic number, because the mean of its divisors is an integer number (331899274000).

Almost surely, 2^{1311002132221} is an apocalyptic number.

It is an amenable number.

1311002132221 is a deficient number, since it is larger than the sum of its proper divisors (16594963779).

1311002132221 is an equidigital number, since it uses as much as digits as its factorization.

1311002132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16594963778.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1311002132221 its reverse (1222312001131), we get a palindrome (2533314133352).

The spelling of 1311002132221 in words is "one trillion, three hundred eleven billion, two million, one hundred thirty-two thousand, two hundred twenty-one".